Improvement in force-pumps



W. MQGREW Force-Pump.

Patented Dec. 11,1877.

N-FETERS PHQTO-LITMOGRAPNER, WASHINGTON, D C

UNITED. STATES PATENT OFFICE.

WILLIAM H. MceREw, or rnnmrnnmnx.

IMPROVEMENT IN FORCE-PUMPS.

Specification forming part of Letters Patent No. 198,136, dated December1 1, 1877; application filed October 18, 1877.

To all whom it may concern:

Be it known that I, WILLIAM H. MOGREW, of Peru, in the county of Miamiand State of Indiana, have invented a certain new and useful Improvementin Force-Pumps, of which the following is a full, clear, and exactdescription, reference bein g had to the accompanying drawings, makingpart of this specification.

My improvement consists, in the main, of the combination of twoopen-topped cylinders, both in communication at bottom with a singlevalve-chamber containing a reciprocating diskvalve, and communicatingwith the dischargepipe, with or without a check valve between thechamber and the pipe.

My improvement also applies to the peculiar construction of the valves,as set forth herein after. p p

In the drawings, Figure l is part in side elevation and part in axialsection through the two cylinders. the reciprocating slide-valve.

A is the hand lever or brake, fulcrumed at a to the top of theair-chamber B, which forms the top of the pump-stock G. D is the spout;and this is arranged with a screw-thread for the coupling of a hose whendesired. 0 is the stock or discharge-pipe leading from the valvechamberF to the spout D. G are rods connected at the upper ends to the brake,and at the lower ends to the pistons H. The rods G I pass, or may pass,through suitable guides g,

and may be jointed, as shown, or may be in one piece from the brake tothe piston. Each piston is connected to the rod G by one, two, or morearms, h, allowing the water free access to the central port h, closed onthe downward movement of the piston by a fiat valve, I, which fits theflat-valve seat I at the bottom of the piston. The valve I consists of asimple flat disk, the top of which comes in contact with the seat I. Thevalve I has an upwardly-extending central guide-stem, i, passing througha guide-bar, h which extends diametrically across the valve-port 71. Atthe top of the valvestem i is a cross-pin, against which engages theupper arm of a spring, J, the lower arm of which has bearing upon theguide-bar Fig.2 is a perspective view of W. The action of the spring Jis to lift the valveI and close the valve-port, and thus the valve iskept closed, except when the piston is ascending in the cylinder L.

H is packing surrounding the piston. This packing may be of leather orany usual or suitable substance. Each cylinder L communicates at thelower end with a valve-chamber, M, through a pipe or passage, m, whichconstitutes the port of the reciprocating valve working in said chamber,the inner end of each pipe on forming the seat of the valve. Thissliding reciprocating valve has a central disk, N, of

sufficient diameter to stop the valve-ports, and

the valve-chamber, carrying the valve .N over, 7

and stopping the port on at the opposite side of the chamber, andforcing the water up the discharge-pipe. At the same time the water ispassing through the port of the other piston as it rises. When thelatter piston has reached its upper posit-ion the spring J closes thevalve I.

I claim as my invention-- 1. The combination of open-topped cylinders L,valves I,valve-c11amber with end ports m, and slide-valves N,substantially as set forth.

2. The valve I in piston H, made fl at to fit the flat bottom of pistonH, and provided with guide-stem i and spring J, substantially as setforth.

3. The combination, with the valve-chamber M, provided with valve-ports,of the valve'with central disk N and end guides a, working in thevalve-ports, substantially as set forth. I

W. H. MGGBEW.

In presence ofv JAMES M. CALVERT, JAMns MEANs, Jr.

